Struggling with normal map
Make sure your models are not intersecting.  Your low poly model should be slightly larger than your high poly model and no part of the high poly model can protrude through any part of your low poly model.  Your model is kind of complex to do all at once.  You may trying breaking it down into smaller pieces (selecting parts in Edit mode and hitting P: By Selection) and baking them all to the same map individually(Uncheck CLEAR in the Bake Panel), then when all parts are baked, rejoin them by selecting all and hitting Ctrl J.